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Automating Manufacturing Systems - Process Control and ...

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plc electrical - 31.20<br />

31.5 REFERENCES<br />

31.6 SUMMARY<br />

• Electrical schematics used to layout <strong>and</strong> wire controls cabinets.<br />

• JIC wiring symbols can be used to describe electrical components.<br />

• Grounding <strong>and</strong> shielding can keep a system safe <strong>and</strong> running reliably.<br />

• Failsafe designs ensure that a controller will cause minimal damage in the event<br />

of a failure.<br />

• PLC enclosure are selected to protect a PLC from its environment.<br />

31.7 PRACTICE PROBLEMS<br />

1. What steps are required to replace a defective PLC?<br />

31.8 PRACTICE PROBLEM SOLUTIONS<br />

1. in a rack the defective card is removed <strong>and</strong> replaced. If the card has wiring terminals these are<br />

removed first, <strong>and</strong> connected to the replacement card.<br />

31.9 ASSIGNMENT PROBLEMS<br />

1. Where is the best location for a PLC enclosure?<br />

2. What is a typical temperature <strong>and</strong> humidity range for a PLC?<br />

3. Draw the electrical schematic <strong>and</strong> panel layout for the relay logic below. The system will be<br />

connected to 3 phase power. Be sure to include a master power disconnect.<br />

A<br />

C<br />

B<br />

B<br />

www.PA<strong>Control</strong>.com

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